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Expendable Parts and Supplies - Disclosure of Expendable Parts and Supplies (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Classes of current inventories [abstract] |  |  |
Material for repair and maintenance | $ 79,424 | $ 71,876 |
Other inventories | 3,058 | 3,101 |
Expendable parts and supplies, gross | 82,482 | 74,977 |
Allowance for obsolescence | (657) | (475) |
Expendable parts and supplies | $ 81,825 | $ 74,502 | $ 62,247

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